One of the simplest ways to save money at the grocery store is to download a coupon app like Ibotta or Checkout 51. These two apps allow you to select coupons and then, once you buy the items, you can scan your receipt and receive cash back for those purchases. It takes almost no time at all and the apps can be used at any store where the receipt prints out a description. The best part is you can use both apps on a single receipt so I have both on my phone.